Guests can view your wishlist and reserve a gift on it — but they can't add, edit, or delete wishes, and they can't change any of your settings.
What a guest can see
The wishlist name, description, and images.
Each wish: its name, price, images, notes, store link, tags, availability, and priority.
Whether a wish is already reserved (so two people don't claim the same gift).
What a guest can do
Reserve a gift, so others know it's taken. Reserving just marks the intent to give it — it isn't buying, and Wishpicks doesn't process the purchase. See "How does gift reservation work?"
Click through to the external store link to buy the item there.
What a guest cannot do
Guests can't add, edit, delete, or reorder wishes, and they can't rename the wishlist or change any of its settings.
A few details
Editing a wishlist is a separate role you grant by email, so guests with the link never get edit access. See "What's the difference between an editor, a guest, and someone reserving a gift?"
By default, reserving stays a surprise. You won't even see that a gift was reserved unless you turn on Reveal reservations — see "How do I make sure my friends can reserve a gift?"